--- old/src/share/vm/runtime/globals.hpp	2015-07-01 17:50:57.397050753 -0400
+++ new/src/share/vm/runtime/globals.hpp	2015-07-01 17:50:57.247051721 -0400
@@ -1698,6 +1698,35 @@
           "during card table scanning")                                     \
           range(1, max_intx)                                                \
                                                                             \
+  manageable(bool, UseDynamicParGCStrides, true,                            \
+          "Enables auto-tuning of ParGCCardsPerStrideChunk "                \
+          "based on the capacity of the old generation")                    \
+                                                                            \
+  manageable(size_t, DynamicParGCStridesMinOldGenCapacity, G,               \
+          "Old generation capacity lower bound for the auto-tuning "        \
+          "heuristics of ParGCCardsPerStrideChunk")                         \
+          constraint(DynamicParGCStridesMinOldGenCapacityConstraintFunc)    \
+                                                                            \
+  manageable(size_t, DynamicParGCStridesMaxOldGenCapacity,                  \
+                                             NOT_LP64(2*G) LP64_ONLY(16*G), \
+          "Old generation capacity upper bound for the auto-tuning "        \
+          "heuristics of ParGCCardsPerStrideChunk")                         \
+          constraint(DynamicParGCStridesMaxOldGenCapacityConstraintFunc)    \
+                                                                            \
+  manageable(size_t, DynamicParGCStridesMinSize, 256,                       \
+          "ParGCCardsPerStrideChunk lower bound for the "                   \
+          "auto-tuning heuristics")                                         \
+          constraint(DynamicParGCStridesMinSizeConstraintFunc)              \
+                                                                            \
+  manageable(size_t, DynamicParGCStridesMaxSize,                            \
+                                              NOT_LP64(512) LP64_ONLY(8*K), \
+          "ParGCCardsPerStrideChunk upper bound for the "                   \
+          "auto-tuning heuristics")                                         \
+          constraint(DynamicParGCStridesMaxSizeConstraintFunc)              \
+                                                                            \
+  product(bool, PrintDynamicParGCStrides, false,                            \
+          "Print info on auto-tuning of ParGCCardsPerStrideChunk")          \
+                                                                            \
   product(uintx, OldPLABWeight, 50,                                         \
           "Percentage (0-100) used to weight the current sample when "      \
           "computing exponentially decaying average for resizing "          \